Current Greens leader Giz Watson says the "tsunami" win by the Liberal party could lead to a lack of accountability in parliament.

"My biggest concern with such a swing to the Liberals is that it's not very good for the scrutiny of legislation and democracy to have such a thumping majority by any party."

It is likely that Ms Watson, who has held a spot in the Legislative Council since 1996, will lose her seat after switching from the North Metropolitan Region to the run in the South West region at this election.

It appears likely that Alison Xamon has also missed out in the East Metropolitan region, with Lynn MacLaren (South Metropolitan) and Robin Chapple (Mining and Pastoral) likely to be returned.

Ms Watson says a possible reason behind the Liberals' popularity gain is the public's lack of awareness about where exactly their votes are going.

"Being out there on the booth and talking to people, there's a woeful lack of understanding of the importance of parliament, as opposed to the importance of the executive and the day to day running [of parliament]- and I think probably that is what shows up in the vote."

The last time the Greens held only two seats in the Legislative Council was when Pauline Hanson's One Nation party was prominent in 2001.

Ms Watson says this year's result is similar, with the Shooters and Fishers party set to win a seat.

"Those were interesting times, and you will get people who will represent a particularly extreme view in one way or another - let's see what they're like as legislators, and how they actually work in parliament."

Geoff Hutchison spoke to Giz Watson on Monday about the loss of power for the Greens in the Upper House, and her plans for the future.